High life and Upper crust

High life noun - Excessive spending.

Upper crust and high life are semantically related. in high society topic. In some cases you can use "Upper crust" instead a noun phrase "High life", when it comes to topics like upper class, wealthy fashionable people, fashionable society, cream of society.

Upper crust noun - Individuals carefully selected as being the best of a class.

High life and upper crust are semantically related. You can use "High life" instead a noun phrase "Upper crust".